package com.xc.shopping_font.filter;


import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

import static com.xc.shopping_font.common.Result.error;

/**
 * 检查用户是否已经完成登录
 */


@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
//    路径匹配器,支持通配符
    public  static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();


    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

//        获取本次请求的URi
        String requestURI = request.getRequestURI();

        String[] urls = new String[]{
                "/customer/login","/customer/register","/customer/logout","/banner/**","/goods/**","/homeCate/**"
                ,"/productcat/**"

        };

//        判断本次请求是否需要处理
        boolean check = check(urls,requestURI);

        if(check){
            log.info("本次请求不需要处理{}",requestURI);
            filterChain.doFilter(request,response);
            return;
        }


//        判断登录状态，如果已经登录，则放行
        if(request.getSession().getAttribute("customer") != null){
            log.info("用户已登录，用户id为:{}",request.getSession().getAttribute("customer"));
            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户未登录");
//    如果未登录则返回登录结果，通过输出流的方式向客户端页面响应数据
//        response.getWriter().write(error("401","NOTLOGIN"));
        response.getWriter().write(String.valueOf(error("401","NOTLOGIN")));
        return ;


    }

    /**
     * 检查当前路径是否需要放行
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
      for(String url : urls){
          boolean match = PATH_MATCHER.match(url,requestURI);
          if(match){
              return true;
          }

      }
        return false;
    }


}
